Electrical measuring instrument.



w. G. MYLIUS & Bge. LA BAR. ELCTRICA'. MEASLIFHNG` INSTRUMENT.

APPLICATION flLED AUG49, QI- 1,248,527. Patented Dec. ll, 19"! WITNESSES: INVENTOR f /V/f 6 /W /fw M 5er# a a @r lof which the following is a specification.

UNITED STATES PATENT OFFICE.

WALTER G. MYLIUS, 0F WILKINSBURG, AND BER/ G. LA BAR, OF 'J'URTLE CREEK,

PENNSYLVANIA, ASSIGNORS TO WESTINGHOUSE ELECTRICAND MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

ELECTRICAL MEASURING INSTRUMENT.

To all inkom it may concern.'

VBe it known that We, WALTER G. MYLiUs, a citizen of the United States, and a resi dent ofWilkinsburg, in the county of Alle ,gheny and State oi Pennsylvania, and BERT- G. LA Ban, a citizen of the United States, and a resident ofTurtle Creek, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Iinprovement in Electrical lVl'easuring- Instruments,

Our invention relates to electrical incasuring instruments and particularly to light load adjusting devices ior such instruments.

j lhe object of our invention is to provide a device of the above indicated character that shall be simple and cheap 'to construct, effective in its operation and easily adjustable.

[Ii-the carryingout of our invention, We provide a 4supporting"member, a movable vshoirtlcircuited` conductor, a worin Wheel operatively connected to the conductor, a .Worm screw orfactuating the Worm Wheel and a single` resilient member that is opera tively connected to the Worin Wheel and the Worin screw for securing' the same to the supporting member and for holding them in eiiective engagement.

Figure 1 of the accompanying drawings is a plan View, partially broken away, of an electrical measuring instrument embodying our invention, Figs.` 2 and 3 are detail ele` vational` and plan views, respectively, of the lightfload. adjusting device embodying `our invention, Figs. 4.- and 5 are detail front and side elevational views, respectively, of the supportinginember embodying our invention, and Figs. 6 and 7 are detail plan and elevational views, respectively, of the s rin embod in our invention.

` tively light loads.

An electrical measuring instrument 1 oomprises asupportingfranie 2, a rotatable armature 3, damping magnets 4 and a magnetizable c'ore member 5. A keeperor mag'- netizable member (iis mounted on the frame 2 adjacent andparallel-to the faces ofthe pole pieces ofthe magnetizalole core meniber 5, and va 1ight-load adjusting device 7 is provided Vfor the purpose of so controlling the torque of the armature 3 that Vit will develop a suiiiciently large torque to over come the friction of the instrument at rele# Specification of Lett-ers Patent.

Patented D'ei. 4, 1917.

The lighi';--load adjusting dev-ice Z comprises a closed-ciii'cuit conductor 8 that is iixedly mounted on a spindle ,Si which is supported hy a housing or supporting member l0. The supporting mein'ner l() s inolinted on the frame 2 and it is piiiivided with openings to receive they spindle 9 iiid a Worinscrew ll. A Worin Wheel 12 is mounted on the spindle 9, and helical spring 13 suri'cuinds the spindle and is operativeiy connected thereto atene of' its ends The worin screw i3'. provided .with an annular recess l5, at its ujiper end, in which is disposed the other end 'i6 of the serine," i3. The Worin screw il is provided with a slit l? in its head for receiving a screw driver or other siniiiar actuating device.

TNhen the worin screw lil turned, it is adapted to drive the Worin Wheel 1Q and, consequently, the conductor 8. l3nt, since the turning of the spindle 9 tensions the spring, and since the tensioning of the spring tends to hind the turning of the screw l1, it Will he understood that the spring 13 Will so cooperate with the Worin screw 11 and ivorni Wheel 12 as. to preclude the movement of the conductor 8` unlessthe worin screw il is turned. Since-the end 14 of spring 123 is inserted in an opening in 'the spindle 9, it holds the spindle in posi tion in. the supporting member 1.0. Sinai* larly, since a portion of the spring'i is dis posed in the annular recess l5 of the Worin screw il, it holds the saine in position in the sujiporting member i0.

If the closed-circuit 'conductor 8 is disposed adjacent the pole pieces of the mag netizable core inember 5 and the armature, itvviil he understood that, for diii'erent positions relative to the pole pieces, it Will either assist or oppose the torque of the armature. wllhus, if the conductor 8 is so disposed, by turning the Worm screw l1,

that it will cansetlie armature to develop just sucient torque to overcomel the' fricf any position to` which it is moved by the` .movement of worm screwrll, and the springr f 13 Will so holdit in V Vat position thatifit will not `he moved inadvertently.

lau

While We have illustrated our invention in connection with the light-load adjusting device of anv electrical measuring instrmnent, it Will lue-understood that its application is not so'liniited, since it may be variously niodifiedivvithin the spirit and scope of the invention, as set forth in the appended claims.

We Claim .is our invention:

1. The combination with n supporting member, of u spindle, a. worm wheel mounted on the Spindle, a worm screw adopted to enga-ge the worm Wheel7 und n spring :idziptedf/o surround the Spindle, one end of the Spring beingattnehed to the spindle and the otherend being adapted to hold the. worm screw in posltion vin the`V si'lpporting member.

2. The combination with n. supporting member. of n spindle, a worm wheel nlount- .ed on the spindle, i worm screw adapted to engage. the worm wheel, :ind n. single, resilient means forholding Ythe. worm sei-ew and the Spindle in the supl'iorting member and for so Securing the worm wheel :1nd worm screw together that the spindle will turn only when the worm Serew is turned..

BQThe combination with :i snpportiiig' member, of a rotatable worm wheel, n. worin Screw, and a lingle means for holding the worm wheel und the worm screw in engagement within the' supporting member.

4..'1`he combination with :L supporting member, of a movable conductor, a worm wheel operatively connected to the (fonduetor, n worm sei-ew, und mennsil'or securing;

`iin l n. spring for securing the worm wheel und screw in engagement und. in position in the, supporting member.

(i. In :L light-load adjusting tleviee for electric meters, the eombinnt-io'n with n movable conductor. of :l supporting member. :L worm wheel operatively connected tothe movable conductor, nA worin screw, and :i springr for securing the worm wheel :1nd the screw in position in the. :mpportino` member.

T. In :i light-load :uljuetingi4 device -for eleetrie meters, the combination with n movnble conductor, 'of a Supporting member, :t worin wheel opernti\'ely oiinneeted to the movable eomhietor,l :i worm Screw.- und :i spring for seeuring the. worm wheel and the, sorew in position in l'he supporting member zindi'or so Securing lbe 'worm screw in engagement with the worm wheel that 'the eondueior muy be moved only b v turning the worm screw.

In testimony whereof, we. have hereunto subseribedsour names this 21st dey o'fJuly.

yNVALIER G. MYI-il US.

vBERT (lr. LA HAR. 

